Figure 1. .
Ganzfeld bowl stimulus and pupil recording apparatus used in this study. Top left: A red stimulus light is presented to the subject who is seated at a fixed distance from the bowl. Top right: The eye frame with miniature video cameras and infrared light illuminators are shown. Bottom: The infrared video image of pupils being recorded is shown. Reprinted with permission from Kardon R, Anderson SC, Damarjian TG, Grace EM, Stone E, Kawasaki A. Chromatic pupil responses: preferential activation of the melanopsin-mediated versus outer photoreceptormediated pupil light reflex. Ophthalmology. 2009;116:1564–1573.34 Copyright Elsevier 2009.